Elementor differences between preview and real time website

Hello,
I’ve been editing my main page with elementor and once I’ve found the result and look I was willing to give my website, I do upload the modifications, and when checking the page in real-time the characters are changed and moved and it looks like all the interactive aspects are static and not looking as they should.

I know or imagine the solution is easy yet I cannot solve it.
Ps: Changing from H1 to H4 and other pieces of advice I tried weren’t working either.

Thank you in advance,
Alexis

The page I need help with: [log in to see the link]